<?php
/*
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Library General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

namespace EasyActionPHP\Util;

class QuickSortUtil {

    private static function partition(&$array, $f, $l, $property) {
        $pivot = $array[$f]->$property;
        while ($f < $l) {
            while ($array[$f]->$property < $pivot)
                $f++;
            while ($array[$l]->$property > $pivot)
                $l--;
            $temp = $array[$f];
            $array[$f] = $array[$l];
            $array[$l] = $temp;
        }
        return $f;
    }

    public static function sort(&$array, $property, $f = null, $l = null) {
        if (is_null($f)) {
            $f = 0;
        }
        if (is_null($l)) {
            $l = count($array) - 1;
        }
        if ($f >= $l) {
            return;
        }
        $pivot_index = self::partition($array, $f, $l, $property);
        self::sort($array, $property, $f, $pivot_index);
        self::sort($array, $property, $pivot_index + 1, $l);
    }

}

?>